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Letters Patent No. 80,239, dateolJuZy 21, 1868.

IMPROVEMENT IN PROPELLIN VESSBLS.

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To ALL WHoM IT MAY eoNeERN';

Be it known that I, OLIVER TENNY, of Litt-Eaton, in the county of'Middlesex, and State of Massachusetts,

have invented a new and useful Mode of Propelling Vessels; and I'dohereby declare the following to be a. full,

clear, and exact description of thelsame, sutlicient to enable othersskilled iu the art to' which invention app'ertains'to fully understandand use the same, reference being had to the accompanying drawings,which are made a part of this specification, and in 'whichi Fi'agure 1may represent a plan of-a portion of a vessel withmypropelling-apparatus applied.,

Figure is a longitudinal section of the same,the planeA of section'beingthrough one of the cylinders hereinafterreferred to. I

Figures `3 and 4 are longitudinal sections of said cylinders.

Similar letters of reference indicate corresponding parts in the severalfigures. i

The object of this invention is to provide a novel and simple apparatuswhereby vessels may be propelledin a most effective and economicalmanner. i

In the drawingsa aa a may represent a. series ot' cylinders, suitablymounted, in parallel positions, inthe stern ofthe vessel', and below the`water-line'. The outer ends oi' vthese cylinders are open to the water,whose natural tendency is to flow into the same. s The inner ends of thecylinders Q may be closed so as to afford guides for the'rodsb te theshalt d, which has-cranks d for the attachment of the rods c, and of therod which may be employed to impart a rotary motion to said shaft, thesame being driven by an ngine or otherwise.

The rotary motion of the shaft dgives n reciprocating motion to the rodsb, and to the heads orfollowers'e,

which are fitted therein. No vacuum is created within the cylindersaiwhed the heads e are drawn inwards,

said heads being fivtted loosely or provided with apertures tovadmit ofthe free passage of the air from side'to side. The effect of this is torelieve the driving-muchinery of as much resistance as would be involvedin recip.-

rocating the bends or followers e, if the latter were made to act assucking-plungers.

ff are disks or pistons, fitted within the cylinders a a, one for each,and working between the heads eend the open ends of said cylinders. Thedisksf are confined within the cylinders by the stop-rods g`, and saiddish-s are free to move buck and forth within the cylinders, yet theyare fitted sufliciently tight to prevent the water-from reaching theheads or followers c. v *l By referring to fig. 2the operetion'will bereadily understood. It will be observed that when the heads ezhave beendrawn inward, the water entering the cylinders causes the correspondingdisks f to recede in the direction of the heads'e. The rods Z ,`togetberwith the heads e, being then moved outward, the disks f are' i'rnpelledagainst the water, which, in being ejected from the cylinders, reactsand propels the vessel.

Having thus described my invention, whatI claim as pew, and desire'tosecure by Letters Batent, is-

'.lhe combination, with the cylinders a, ofthe heads or followers e anddisks or pistonsf, all arrangedaud epcrating substantially as described.4 i

The abovespecification of my improvement in mode of propelling vessels,signedetliis' day, the 12thfof February, 1868. i

OLIVER TENNY. Witnesses:

' Jneon Hnnnr,

Louis BnonnAe.

